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Yoshimura RS9 Stainless System - Honda CRF 450 2017-Current

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Yoshimura RS9 Stainless Dual Pipe System for Honda CRF 450 R & RX 2017-Current - Yoshimura Exhaust Systems

Yoshimura are pleased to announce the forthcoming Yoshimura Signature Series RS9 system for 2017 Honda CRF450!

The 2017 CRF450R's new engine and muffler configuration gave us the opportunity to create an entirely new system built specifically for the new CRF450 machines. Introducing our all-new Signature Series RS-9T tapered dual muffler exhaust system for the all new CRF450R.

Yoshimura has been working tirelessly on development with American Honda HRC's engineers to achieve maximum performance and mass centralization, to optimize rider usability. Yoshimura achieved all this by moving the new RS-9T mufflers forward in order to tuck in under the side number plates. Working with HRC race engineers and the all-new 449cc Unicam engine and its unique downdraft fuel injection system, Yoshimura was able to deliver an exhaust that provides more tractable power and improved torque.

Yoshimura RS9 Honda CRF 450 2017 System

Yoshimura's constant race development with the Muscle Milk Honda and Geico Honda race teams has helped develop this proven Signature Series RS9 system. We worked in secret with Top AMA Pro Riders: Jeremy McGrath, Justin Barcia, Trey Canard, Eli Tomac, and Justin Brayton, to achieve maximum performance, mass centralization, and optimise rider-usability. We were able to achieve all this while keeping sound levels in check with AMA Regulation.

Beginning with the head-pipe, a 3-stage tapered design results in better power, better throttle response, and usable power delivery. It is also spring mounted for increased durability.

The header flows seamlessly into a re-configured tail-pipe, where the exhaust's gases are separated to each muffler. Yoshimura's vertical divider splits the exhaust gases more evenly, for smoother flow, which improves mid-top power and throttle response.

Divided exhausts gases then reach our new, dual RS-9 mufflers, hence RS-9D. RS-9's parallelogram-shaped muffler body increases muffler volume over the stock system, resulting in better throttle response and improved noise cancellation. The dual setup enabled us to position the mufflers closer to the bike's centre of gravity (mass centralization) resulting in better handling for the rider. An additional benefit of the mass centralisation process was decreasing the potential for muffler damage in the event of the crash.

RS-9D not only makes more power and torque possible but does it more quietly than single systems. The uniquely sculpted Carbon Fibre end-caps feature a Tunable Insert System, able to fine-tune power delivery and decibel levels to rider specifications.

Motocross and Enduro sound legal... out of the box.

Full System features dual RS-9 Aluminum Sleeved Mufflers with Carbon Fibre End-caps, Stainless Steel Header and Tail-pipe, installation hardware, and detail step-by-step instructions.


Yoshimura RS9 Stainless Dual Exhaust Pipe System features:

  • Dyno and track tested by Honda R&D in Japan, American Honda MX Team, and HRC All Japan MX Racing Team
  • 3-stage header provides broader overall range of power and throttle response
  • New tail pipe divider creates smoother exhaust flow and better velocity to the right and left tail pipe
  • New compact forward positioned RS-9T dual muffler design provides lower centre of gravity for better mass centralization
  • Larger RS-9T core creates improved throttle response and power in mid and top end
  • New RS-9T mufflers have more volume than stock to provide a decrease in overall dB noise level
  • Works with or without Honda's new optional electric start system
  • Stainless Steel Header and Tailpipe
  • 94Db Out of the Box!